How to get the exchage rate value through X++ in AX 2012

static void getExchangeRate(Args _args)
{
    ExchangeRateHelper         _ExchangeRateHelper;
    CurrencyExchangeRate       _CurrencyExchangeRate1;
    CurrencyExchangeRate       _CurrencyExchangeRate2;
  
    _ExchangeRateHelper = ExchangeRateHelper::newExchangeDate(Ledger::current(),"USD",today());
   
    _CurrencyExchangeRate1 = _ExchangeRateHelper.getExchangeRate1();
    _CurrencyExchangeRate2 = _ExchangeRateHelper.getExchangeRate2();
  
    info(strFmt("%1 - %2",_CurrencyExchangeRate1,_CurrencyExchangeRate2));
}